(19)
(11) EP 4 198 285 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.08.2023 Bulletin 2023/33

(43) Date of publication A2:
21.06.2023 Bulletin 2023/25

(21) Application number: 22208022.8

(22) Date of filing: 17.11.2022
(51) International Patent Classification (IPC): 
F02C 7/262(2006.01)
F02K 5/00(2006.01)
 F02C 7/268(2006.01)
(52) Cooperative Patent Classification (CPC):
F02C 7/262; F02C 7/268; F02K 5/00; F05D 2220/76; Y02T 50/60; F05D 2270/092; F05D 2270/093
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA
Designated Validation States:
KH MA MD TN

(30) Priority: 14.12.2021 GB 202118041

(71) Applicant: Rolls-Royce plc
London N1 9FX (GB)

(72) Inventors:
  • Moore, Gareth
    Derby, DE24 8BJ (GB)
  • Davies, Paul
    Derby, DE24 8BJ (GB)
  • Husband, Stephen
    Derby, DE24 8BJ (GB)
  • Trainer, David
    Derby, DE24 8BJ (GB)
  • Scothern, David
    Derby, DE24 8BJ (GB)
  • George, Luke
    Derby, DE24 8BJ (GB)
  • Herbert, Douglas
    Derby, DE24 8BJ (GB)

(74) Representative: Rolls-Royce plc 
Intellectual Property Dept SinA-48 PO Box 31
Derby DE24 8BJ
Derby DE24 8BJ (GB)

   


(54) RESTARTING A GAS TURBINE ENGINE


(57) Multi-engine aircraft power and propulsion systems 100 and methods 300 of restarting an engine 110b of a multi-engine aircraft 1 during fight are provided. One such method 300 comprises: determining a condition to the effect that a flame in the combustion equipment of the second gas turbine engine has been extinguished; responsive to the determination, supplying electrical power from the electrical energy storage system to one or more of the electric machines of the second gas turbine engine and operating said one or more electric machines as motors to limit a reduction in a speed of the one or more spools of the second gas turbine engine following extinguishment of the flame in its combustion equipment; and restarting the second gas turbine engine 110b by relighting the combustion equipment 16 of the second gas turbine engine 110b.







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